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This study describes the architectural and surface morphology of small, 5.6−6.7 cm diameter burrows that occur in close proximity to the Daemonelix burrows of palaeocastorin beavers in the early Miocene upper Harrison Formation, Nebraska. The small-diameter burrows are sinuous and rambling or weakly helical in morphology. Distinctive paired grooves from rodent incisors, measuring 4.1−4.3 mm wide,...